[jQuery] Writing Efficient Plugins

[jQuery] Writing Efficient Plugins

<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt">When writing plugins, in general, when should I use jquery functions over standard javascript? (Sorry that question expose my ignorance.)
I wondering when I should use a this.each in favor of a standard loop statement, or when to use getElementById instead of the dollar function?
My worry is that referencing these functions has some overhead costs, and so wondering best practices.
Thanks much.
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